Long-term stability of the microstructure of austenitic ODS steel rods produced with a carbon-containing process control agent

Gräning, Tim; Klimenkov, M.; Rieth, M.; Heintze, C.; Möslang, A.

doi:10.1016/j.jnucmat.2019.05.060

Cited by 7 publications

(3 citation statements)

References 42 publications

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“…Moreover, the higher Cr content further increases the corrosion resistance. Several austenitic ODS steels derived from the commercial non-ODS, austenitic steels AISI 304 [18][19][20][21][22][23], AISI 310 [24][25][26] and AISI 316 [27][28][29][30][31][32][33][34] have been investigated regarding their microstructural and mechanical properties. Nevertheless, a detailed discussion of the correlation between microstructure and strength is missing in most cases.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependent strengthening contributions in austenitic and ferritic ODS steels

Seils

Kauffmann

Hinrichs

et al. 2020

Materials Science and Engineering: A

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We aim on the model-based description of the strength of ferritic and austenitic oxide dispersion strengthened (ODS) steels in the temperature range from room temperature (RT) up to 800 °C. Therefore, we present two approaches for the synthesis of austenitic alloys by mechanical alloying Y2O3, namely with (i) elemental powders at RT and (ii) with a gas-atomized master-alloy. Consolidation of both powders by field assisted sintering technique leads to a more homogenous distribution of grain size and particles in specimens from elemental powders. In the entire temperature range, the compressive strength of the austenitic ODS steels is shown to be lower compared to the one of ferritic counterparts. Above approximately 500 °C, a strong decrease in strength was observed for all ODS variants due to the onset of creep-based deformation. Multi-scale materials characterization was performed to quantitatively assess microstructural materials parameters crucial for the modeling of the temperature dependent yield strength. These data were utilized to quantitatively describe the strength contribution by Hall-Petch and Orowan strengthening as well as dislocation strengthening at RT. Lower amounts of grain boundary and dislocation strengthening were found to be crucial for the lower strength of austenitic ODS steels. Meaningful calculation of materials strength is only achieved, when both interactions of strengthening contributions and experimental uncertainties are considered.Models describing diffusion-based creep (by Coble) and dislocation-based creep (by Blum and Zeng), which were shown to provide a more appropriate description of high temperature strength, are critically assessed for temperatures at and above the strength drop. It is shown that the deformation at high temperatures is possibly dominated by the formation and annihilation of dislocations at grain boundaries.

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Section: Introductionmentioning

confidence: 99%

Temperature dependent strengthening contributions in austenitic and ferritic ODS steels

Seils

Kauffmann

Hinrichs

et al. 2020

Materials Science and Engineering: A

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show abstract

“…presents a detailed analysis of interacting b½<111> loops with different Burgers vector directions. The 150 nm sized loop with b½ [1][2][3][4][5][6][7][8][9][10][11] (red color) interacts with two 20 nm sized loops having a b½[111] Burgers vector (blue color). The colors used for the labeling the Burgers vector were selected according to Tab.…”

Section: Investigation Of Materials Irradiated At 400°cmentioning

confidence: 99%

“…The importance of this topic is shown by the fact that dozens of ODS alloys have been developed, optimized and tested over the last two decades, and yet this has not lost any of its relevance [3][4][5]. The most recent development focus on the production and characterization of austenitic ODS alloys [6]. An ODS variant of EUROFER97 was developed with the purpose of further increasing the operating temperature and thus the efficiency of advanced blanket concepts for fusion reactors.…”

Section: Introductionmentioning

confidence: 99%

Post-irradiation microstructural examination of EUROFER-ODS steel irradiated at 300°C and 400°C

Klimenkov

Jäntsch

Rieth

et al. 2021

Journal of Nuclear Materials

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Spark plasma sintering of tungsten-based WTaVCr refractory high entropy alloys for nuclear fusion applications

Yoo,

Zhang,

Wang

et al. 2024

Int J Miner Metall Mater

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Long-term stability of the microstructure of austenitic ODS steel rods produced with a carbon-containing process control agent

Cited by 7 publications

References 42 publications

Temperature dependent strengthening contributions in austenitic and ferritic ODS steels

Temperature dependent strengthening contributions in austenitic and ferritic ODS steels

Post-irradiation microstructural examination of EUROFER-ODS steel irradiated at 300°C and 400°C

Spark plasma sintering of tungsten-based WTaVCr refractory high entropy alloys for nuclear fusion applications

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